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Ultrasonic degradation of perfluorooctane sulfonic acid (PFOS) correlated with sonochemical and sonoluminescence characterisation

Wood, Richard James, Sidnell, Tim, Ross, Ian, McDonough, Jeff, Lee, Judy and Bussemaker, Madeleine (2020) Ultrasonic degradation of perfluorooctane sulfonic acid (PFOS) correlated with sonochemical and sonoluminescence characterisation Ultrasonics Sonochemistry.

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Abstract

Sonolysis has been proposed as a promising treatment technology to remove per- and polyfluoroalkyl substances (PFASs) from contaminated water. The mechanism of degradation is generally accepted to be high temperature pyrolysis at the bubble surface with dependency upon surface reaction site availability. However, the parametric effects of the ultrasonic system on PFAS degradation are poorly understood, making upscale challenging and leading to less than optimal use of ultrasonic energy. Hence, a thorough understanding of these parametric effects could lead to improved efficiency and commercial viability. Here, reactor characterisation was performed at 44, 400, 500 and 1000 kHz using potassium iodide (KI) dosimetry, sonochemiluminescence (SCL), and sonoluminescence (SL) in water and PFOS solution. Then the degradation of PFOS (10 mg / L in 200 mL solution) was investigated at these four frequencies. At 44 kHz, no PFOS degradation was observed. At 400, 500 and 1000 kHz the amount of degradation was 96.9, 93.8 and 91.2%, respectively, over four hours and was accompanied by stoichiometric fluoride release, indicating mineralisation of the PFOS molecule. Close correlation of PFOS degradation trends with KI dosimetry and SCL intensity was observed, which suggested degradation occurred under similar conditions to these sonochemical processes. At 1000 kHz, where the overall intensity of collapse was significantly reduced (measured by SL), PFOS degradation was not similarly decreased. Discussion is presented that suggests a solvated electron degradation mechanism for PFOS may occur in ultrasonic conditions.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Wood, Richard James
Sidnell, Timt.sidnell@surrey.ac.uk
Ross, Ian
McDonough, Jeff
Lee, Judyj.y.lee@surrey.ac.uk
Bussemaker, Madeleinem.bussemaker@surrey.ac.uk
Date : 18 April 2020
Funders : Arcadis, Royal Society, Royal Academy of Engineering
Grant Title : Royal Society Research Grant
Uncontrolled Keywords : Perfluorooctanesulfonic acid; hydrated electron; frequency; sonoluminescence; sonochemiluminescence; KI dosimetry
Depositing User : James Marshall
Date Deposited : 28 May 2020 16:03
Last Modified : 28 May 2020 16:03
URI: http://epubs.surrey.ac.uk/id/eprint/856997

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